Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Summary of Changes in Stockholders' Equity (Detail)

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Stockholders' Equity - Summary of Changes in Stockholders' Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Preferred Stock, Shares Issued, beginning balance 2,150,000  
Preferred Stock, Shares Issued, ending balance 2,224,000  
Common Stock, Shares Issued, beginning balance 22,485,607  
Common Stock, Shares Issued, ending balance 22,550,111  
Senior Common stock, Shares Issued, beginning balance 972,214  
Senior Common stock, Shares Issued, ending balance 959,552  
Total Stockholders' Equity, beginning balance $ 233,871  
Issuance of preferred stock and common stock, net 2,570  
Distributions declared to common, senior common and preferred stockholders (9,736)  
Net income 853 $ 694
Total Stockholders' Equity, ending balance $ 227,558  
Senior Common Stock [Member]    
Retirement of senior common stock (12,662)  
Total Stockholders' Equity, beginning balance $ 1  
Total Stockholders' Equity, ending balance $ 1  
Preferred Stock [Member]    
Issuance of preferred stock and common stock, net 74,000  
Total Stockholders' Equity, beginning balance $ 2  
Total Stockholders' Equity, ending balance $ 2  
Common Stock [Member]    
Issuance of preferred stock and common stock, net 64,504  
Total Stockholders' Equity, beginning balance $ 22  
Issuance of preferred stock and common stock, net 1  
Total Stockholders' Equity, ending balance 23  
Additional Paid in Capital [Member]    
Total Stockholders' Equity, beginning balance 418,897  
Issuance of preferred stock and common stock, net 2,569  
Total Stockholders' Equity, ending balance 421,466  
Distributions in Excess of Accumulated Earnings [Member]    
Total Stockholders' Equity, beginning balance (185,051)  
Distributions declared to common, senior common and preferred stockholders (9,736)  
Net income 853  
Total Stockholders' Equity, ending balance $ (193,934)